CP-Violatiing Asymmetries in $e^+e^-\ra t\bar{t}$ with Longitudinally Polarized Elecrtons

Details CP-Violatiing Asymmetries in $e^+e^-\ra t\bar{t}$ with Longitudinally Polarized Elecrtons CP-Violatiing Asymmetries in $e^+e^-\ra t\bar{t}$ with Longitudinally Polarized Elecrtons

1994-10-24

arxiv.org/abs/hep-ph/9410357v1

Phys.Lett.B349:379-385,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages LaTex,PRL-TH-94/31

Scientific paper

10.1016/0370-2693(95)00193-O

New CP-violating asymmetries of decay leptons in $e^+\,e^-\;\ra\;t\,\bar{t}$, arising from electric and weak dipole couplings of $t\,\bar{t}$ to $\gamma$ and $Z$, are examined in the case of unpolarized and longitudinally polarized electrons. The new asymmetries measured together with the old ones can help to determine independently the real and imaginary parts of the electric as well as weak dipole couplings. Longitudinal beam polarization, if present, obviates the need for the simultaneous measurement of more than one asymmetry, and enhances considerably the sensitivity to the CP-violating parameters. Numerical results are presented for the Next Linear Collider with $\sqrt{s}=500$ GeV and $\int{\cal L}\,dt\;=\;10\,{\rm fb}^{-1}$.

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